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vm_args.c
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/**********************************************************************
vm_args.c - process method call arguments.
$Author$
Copyright (C) 2014- Yukihiro Matsumoto
**********************************************************************/
NORETURN(static void raise_argument_error(rb_execution_context_t *ec, const rb_iseq_t *iseq, const VALUE exc));
NORETURN(static void argument_arity_error(rb_execution_context_t *ec, const rb_iseq_t *iseq, const int miss_argc, const int min_argc, const int max_argc));
NORETURN(static void argument_kw_error(rb_execution_context_t *ec, const rb_iseq_t *iseq, const char *error, const VALUE keys));
VALUE rb_keyword_error_new(const char *error, VALUE keys); /* class.c */
static VALUE method_missing(rb_execution_context_t *ec, VALUE obj, ID id, int argc, const VALUE *argv,
enum method_missing_reason call_status, int kw_splat);
const rb_callable_method_entry_t *rb_resolve_refined_method_callable(VALUE refinements, const rb_callable_method_entry_t *me);
struct args_info {
/* basic args info */
VALUE *argv;
int argc;
/* additional args info */
int rest_index;
int rest_dupped;
const struct rb_callinfo_kwarg *kw_arg;
VALUE *kw_argv;
VALUE rest;
};
enum arg_setup_type {
arg_setup_method,
arg_setup_block
};
static inline void
arg_rest_dup(struct args_info *args)
{
if (!args->rest_dupped) {
args->rest = rb_ary_dup(args->rest);
args->rest_dupped = TRUE;
}
}
static inline int
args_argc(struct args_info *args)
{
if (args->rest == Qfalse) {
return args->argc;
}
else {
return args->argc + RARRAY_LENINT(args->rest) - args->rest_index;
}
}
static inline void
args_extend(struct args_info *args, const int min_argc)
{
int i;
if (args->rest) {
arg_rest_dup(args);
VM_ASSERT(args->rest_index == 0);
for (i=args->argc + RARRAY_LENINT(args->rest); i<min_argc; i++) {
rb_ary_push(args->rest, Qnil);
}
}
else {
for (i=args->argc; i<min_argc; i++) {
args->argv[args->argc++] = Qnil;
}
}
}
static inline void
args_reduce(struct args_info *args, int over_argc)
{
if (args->rest) {
const long len = RARRAY_LEN(args->rest);
if (len > over_argc) {
arg_rest_dup(args);
rb_ary_resize(args->rest, len - over_argc);
return;
}
else {
args->rest = Qfalse;
over_argc -= len;
}
}
VM_ASSERT(args->argc >= over_argc);
args->argc -= over_argc;
}
static inline int
args_check_block_arg0(struct args_info *args)
{
VALUE ary = Qnil;
if (args->rest && RARRAY_LEN(args->rest) == 1) {
VALUE arg0 = RARRAY_AREF(args->rest, 0);
ary = rb_check_array_type(arg0);
}
else if (args->argc == 1) {
VALUE arg0 = args->argv[0];
ary = rb_check_array_type(arg0);
args->argv[0] = arg0; /* see: https://bugs.ruby-lang.org/issues/8484 */
}
if (!NIL_P(ary)) {
args->rest = ary;
args->rest_index = 0;
args->argc = 0;
return TRUE;
}
return FALSE;
}
static inline void
args_copy(struct args_info *args)
{
if (args->rest != Qfalse) {
int argc = args->argc;
args->argc = 0;
arg_rest_dup(args);
/*
* argv: [m0, m1, m2, m3]
* rest: [a0, a1, a2, a3, a4, a5]
* ^
* rest_index
*
* #=> first loop
*
* argv: [m0, m1]
* rest: [m2, m3, a2, a3, a4, a5]
* ^
* rest_index
*
* #=> 2nd loop
*
* argv: [] (argc == 0)
* rest: [m0, m1, m2, m3, a2, a3, a4, a5]
* ^
* rest_index
*/
while (args->rest_index > 0 && argc > 0) {
RARRAY_ASET(args->rest, --args->rest_index, args->argv[--argc]);
}
while (argc > 0) {
rb_ary_unshift(args->rest, args->argv[--argc]);
}
}
else if (args->argc > 0) {
args->rest = rb_ary_new_from_values(args->argc, args->argv);
args->rest_index = 0;
args->rest_dupped = TRUE;
args->argc = 0;
}
}
static inline const VALUE *
args_rest_argv(struct args_info *args)
{
return RARRAY_CONST_PTR(args->rest) + args->rest_index;
}
static inline VALUE
args_rest_array(struct args_info *args)
{
VALUE ary;
if (args->rest) {
ary = rb_ary_behead(args->rest, args->rest_index);
args->rest_index = 0;
args->rest = 0;
}
else {
ary = rb_ary_new();
}
return ary;
}
static int
args_kw_argv_to_hash(struct args_info *args)
{
const struct rb_callinfo_kwarg *kw_arg = args->kw_arg;
const VALUE *const passed_keywords = kw_arg->keywords;
const int kw_len = kw_arg->keyword_len;
VALUE h = rb_hash_new_with_size(kw_len);
const int kw_start = args->argc - kw_len;
const VALUE * const kw_argv = args->argv + kw_start;
int i;
args->argc = kw_start + 1;
for (i=0; i<kw_len; i++) {
rb_hash_aset(h, passed_keywords[i], kw_argv[i]);
}
args->argv[args->argc - 1] = h;
return args->argc;
}
static inline void
args_setup_lead_parameters(struct args_info *args, int argc, VALUE *locals)
{
if (args->argc >= argc) {
/* do noting */
args->argc -= argc;
args->argv += argc;
}
else {
int i, j;
const VALUE *argv = args_rest_argv(args);
for (i=args->argc, j=0; i<argc; i++, j++) {
locals[i] = argv[j];
}
args->rest_index += argc - args->argc;
args->argc = 0;
}
}
static inline void
args_setup_post_parameters(struct args_info *args, int argc, VALUE *locals)
{
long len;
len = RARRAY_LEN(args->rest);
MEMCPY(locals, RARRAY_CONST_PTR(args->rest) + len - argc, VALUE, argc);
rb_ary_resize(args->rest, len - argc);
}
static inline int
args_setup_opt_parameters(struct args_info *args, int opt_max, VALUE *locals)
{
int i;
if (args->argc >= opt_max) {
args->argc -= opt_max;
args->argv += opt_max;
i = opt_max;
}
else {
int j;
i = args->argc;
args->argc = 0;
if (args->rest) {
int len = RARRAY_LENINT(args->rest);
const VALUE *argv = RARRAY_CONST_PTR(args->rest);
for (; i<opt_max && args->rest_index < len; i++, args->rest_index++) {
locals[i] = argv[args->rest_index];
}
}
/* initialize by nil */
for (j=i; j<opt_max; j++) {
locals[j] = Qnil;
}
}
return i;
}
static inline void
args_setup_rest_parameter(struct args_info *args, VALUE *locals)
{
*locals = args_rest_array(args);
}
static VALUE
make_unknown_kw_hash(const VALUE *passed_keywords, int passed_keyword_len, const VALUE *kw_argv)
{
int i;
VALUE obj = rb_ary_hidden_new(1);
for (i=0; i<passed_keyword_len; i++) {
if (!UNDEF_P(kw_argv[i])) {
rb_ary_push(obj, passed_keywords[i]);
}
}
return obj;
}
static VALUE
make_rest_kw_hash(const VALUE *passed_keywords, int passed_keyword_len, const VALUE *kw_argv)
{
int i;
VALUE obj = rb_hash_new_with_size(passed_keyword_len);
for (i=0; i<passed_keyword_len; i++) {
if (!UNDEF_P(kw_argv[i])) {
rb_hash_aset(obj, passed_keywords[i], kw_argv[i]);
}
}
return obj;
}
static inline int
args_setup_kw_parameters_lookup(const ID key, VALUE *ptr, const VALUE *const passed_keywords, VALUE *passed_values, const int passed_keyword_len)
{
int i;
const VALUE keyname = ID2SYM(key);
for (i=0; i<passed_keyword_len; i++) {
if (keyname == passed_keywords[i]) {
*ptr = passed_values[i];
passed_values[i] = Qundef;
return TRUE;
}
}
return FALSE;
}
#define KW_SPECIFIED_BITS_MAX (32-1) /* TODO: 32 -> Fixnum's max bits */
static void
args_setup_kw_parameters(rb_execution_context_t *const ec, const rb_iseq_t *const iseq,
VALUE *const passed_values, const int passed_keyword_len, const VALUE *const passed_keywords,
VALUE *const locals)
{
const ID *acceptable_keywords = ISEQ_BODY(iseq)->param.keyword->table;
const int req_key_num = ISEQ_BODY(iseq)->param.keyword->required_num;
const int key_num = ISEQ_BODY(iseq)->param.keyword->num;
const VALUE * const default_values = ISEQ_BODY(iseq)->param.keyword->default_values;
VALUE missing = 0;
int i, di, found = 0;
int unspecified_bits = 0;
VALUE unspecified_bits_value = Qnil;
for (i=0; i<req_key_num; i++) {
ID key = acceptable_keywords[i];
if (args_setup_kw_parameters_lookup(key, &locals[i], passed_keywords, passed_values, passed_keyword_len)) {
found++;
}
else {
if (!missing) missing = rb_ary_hidden_new(1);
rb_ary_push(missing, ID2SYM(key));
}
}
if (missing) argument_kw_error(ec, iseq, "missing", missing);
for (di=0; i<key_num; i++, di++) {
if (args_setup_kw_parameters_lookup(acceptable_keywords[i], &locals[i], passed_keywords, passed_values, passed_keyword_len)) {
found++;
}
else {
if (UNDEF_P(default_values[di])) {
locals[i] = Qnil;
if (LIKELY(i < KW_SPECIFIED_BITS_MAX)) {
unspecified_bits |= 0x01 << di;
}
else {
if (NIL_P(unspecified_bits_value)) {
/* fixnum -> hash */
int j;
unspecified_bits_value = rb_hash_new();
for (j=0; j<KW_SPECIFIED_BITS_MAX; j++) {
if (unspecified_bits & (0x01 << j)) {
rb_hash_aset(unspecified_bits_value, INT2FIX(j), Qtrue);
}
}
}
rb_hash_aset(unspecified_bits_value, INT2FIX(di), Qtrue);
}
}
else {
locals[i] = default_values[di];
}
}
}
if (ISEQ_BODY(iseq)->param.flags.has_kwrest) {
const int rest_hash_index = key_num + 1;
locals[rest_hash_index] = make_rest_kw_hash(passed_keywords, passed_keyword_len, passed_values);
}
else {
if (found != passed_keyword_len) {
VALUE keys = make_unknown_kw_hash(passed_keywords, passed_keyword_len, passed_values);
argument_kw_error(ec, iseq, "unknown", keys);
}
}
if (NIL_P(unspecified_bits_value)) {
unspecified_bits_value = INT2FIX(unspecified_bits);
}
locals[key_num] = unspecified_bits_value;
}
static void
args_setup_kw_parameters_from_kwsplat(rb_execution_context_t *const ec, const rb_iseq_t *const iseq,
VALUE keyword_hash, VALUE *const locals, bool remove_hash_value)
{
const ID *acceptable_keywords = ISEQ_BODY(iseq)->param.keyword->table;
const int req_key_num = ISEQ_BODY(iseq)->param.keyword->required_num;
const int key_num = ISEQ_BODY(iseq)->param.keyword->num;
const VALUE * const default_values = ISEQ_BODY(iseq)->param.keyword->default_values;
VALUE missing = 0;
int i, di;
int unspecified_bits = 0;
size_t keyword_size = RHASH_SIZE(keyword_hash);
VALUE unspecified_bits_value = Qnil;
for (i=0; i<req_key_num; i++) {
VALUE key = ID2SYM(acceptable_keywords[i]);
VALUE value;
if (remove_hash_value) {
value = rb_hash_delete_entry(keyword_hash, key);
}
else {
value = rb_hash_lookup2(keyword_hash, key, Qundef);
}
if (!UNDEF_P(value)) {
keyword_size--;
locals[i] = value;
}
else {
if (!missing) missing = rb_ary_hidden_new(1);
rb_ary_push(missing, key);
}
}
if (missing) argument_kw_error(ec, iseq, "missing", missing);
for (di=0; i<key_num; i++, di++) {
VALUE key = ID2SYM(acceptable_keywords[i]);
VALUE value;
if (remove_hash_value) {
value = rb_hash_delete_entry(keyword_hash, key);
}
else {
value = rb_hash_lookup2(keyword_hash, key, Qundef);
}
if (!UNDEF_P(value)) {
keyword_size--;
locals[i] = value;
}
else {
if (UNDEF_P(default_values[di])) {
locals[i] = Qnil;
if (LIKELY(i < KW_SPECIFIED_BITS_MAX)) {
unspecified_bits |= 0x01 << di;
}
else {
if (NIL_P(unspecified_bits_value)) {
/* fixnum -> hash */
int j;
unspecified_bits_value = rb_hash_new();
for (j=0; j<KW_SPECIFIED_BITS_MAX; j++) {
if (unspecified_bits & (0x01 << j)) {
rb_hash_aset(unspecified_bits_value, INT2FIX(j), Qtrue);
}
}
}
rb_hash_aset(unspecified_bits_value, INT2FIX(di), Qtrue);
}
}
else {
locals[i] = default_values[di];
}
}
}
if (ISEQ_BODY(iseq)->param.flags.has_kwrest) {
const int rest_hash_index = key_num + 1;
locals[rest_hash_index] = keyword_hash;
}
else {
if (!remove_hash_value) {
if (keyword_size != 0) {
/* Recurse with duplicated keyword hash in remove mode.
* This is simpler than writing code to check which entries in the hash do not match.
* This will raise an exception, so the additional performance impact shouldn't be material.
*/
args_setup_kw_parameters_from_kwsplat(ec, iseq, rb_hash_dup(keyword_hash), locals, true);
}
}
else if (!RHASH_EMPTY_P(keyword_hash)) {
argument_kw_error(ec, iseq, "unknown", rb_hash_keys(keyword_hash));
}
}
if (NIL_P(unspecified_bits_value)) {
unspecified_bits_value = INT2FIX(unspecified_bits);
}
locals[key_num] = unspecified_bits_value;
}
static inline void
args_setup_kw_rest_parameter(VALUE keyword_hash, VALUE *locals, int kw_flag, bool anon_kwrest)
{
if (NIL_P(keyword_hash)) {
if (!anon_kwrest) {
keyword_hash = rb_hash_new();
}
}
else if (!(kw_flag & VM_CALL_KW_SPLAT_MUT)) {
keyword_hash = rb_hash_dup(keyword_hash);
}
locals[0] = keyword_hash;
}
static inline void
args_setup_block_parameter(const rb_execution_context_t *ec, struct rb_calling_info *calling, VALUE *locals)
{
VALUE block_handler = calling->block_handler;
*locals = rb_vm_bh_to_procval(ec, block_handler);
}
static inline int
ignore_keyword_hash_p(VALUE keyword_hash, const rb_iseq_t * const iseq, unsigned int * kw_flag, VALUE * converted_keyword_hash)
{
if (keyword_hash == Qnil) {
goto ignore;
}
else if (!RB_TYPE_P(keyword_hash, T_HASH)) {
keyword_hash = rb_to_hash_type(keyword_hash);
}
else if (UNLIKELY(ISEQ_BODY(iseq)->param.flags.anon_kwrest)) {
if (!ISEQ_BODY(iseq)->param.flags.has_kw) {
*kw_flag |= VM_CALL_KW_SPLAT_MUT;
}
}
if (RHASH_EMPTY_P(keyword_hash) && !ISEQ_BODY(iseq)->param.flags.has_kwrest) {
goto ignore;
}
if (!(*kw_flag & VM_CALL_KW_SPLAT_MUT) &&
(ISEQ_BODY(iseq)->param.flags.has_kwrest ||
ISEQ_BODY(iseq)->param.flags.ruby2_keywords)) {
*kw_flag |= VM_CALL_KW_SPLAT_MUT;
keyword_hash = rb_hash_dup(keyword_hash);
}
*converted_keyword_hash = keyword_hash;
if (!(ISEQ_BODY(iseq)->param.flags.has_kw) &&
!(ISEQ_BODY(iseq)->param.flags.has_kwrest) &&
RHASH_EMPTY_P(keyword_hash)) {
ignore:
*kw_flag &= ~(VM_CALL_KW_SPLAT | VM_CALL_KW_SPLAT_MUT);
return 1;
}
else {
return 0;
}
}
static VALUE
check_kwrestarg(VALUE keyword_hash, unsigned int *kw_flag)
{
if (!(*kw_flag & VM_CALL_KW_SPLAT_MUT)) {
*kw_flag |= VM_CALL_KW_SPLAT_MUT;
return rb_hash_dup(keyword_hash);
}
else {
return keyword_hash;
}
}
static void
flatten_rest_args(rb_execution_context_t * const ec, struct args_info *args, VALUE * const locals, unsigned int *ci_flag)
{
const VALUE *argv = RARRAY_CONST_PTR(args->rest);
int j, i=args->argc, rest_len = RARRAY_LENINT(args->rest)-1;
args->argc += rest_len;
if (rest_len) {
CHECK_VM_STACK_OVERFLOW(ec->cfp, rest_len+1);
for (j=0; rest_len > 0; rest_len--, i++, j++) {
locals[i] = argv[j];
}
}
args->rest = Qfalse;
*ci_flag &= ~VM_CALL_ARGS_SPLAT;
}
static int
setup_parameters_complex(rb_execution_context_t * const ec, const rb_iseq_t * const iseq,
struct rb_calling_info *const calling,
const struct rb_callinfo *ci,
VALUE * const locals, const enum arg_setup_type arg_setup_type)
{
const int min_argc = ISEQ_BODY(iseq)->param.lead_num + ISEQ_BODY(iseq)->param.post_num;
const int max_argc = (ISEQ_BODY(iseq)->param.flags.has_rest == FALSE) ? min_argc + ISEQ_BODY(iseq)->param.opt_num : UNLIMITED_ARGUMENTS;
int given_argc;
unsigned int ci_flag = vm_ci_flag(ci);
unsigned int kw_flag = ci_flag & (VM_CALL_KWARG | VM_CALL_KW_SPLAT | VM_CALL_KW_SPLAT_MUT);
int opt_pc = 0, allow_autosplat = !kw_flag;
struct args_info args_body, *args;
VALUE keyword_hash = Qnil;
VALUE * const orig_sp = ec->cfp->sp;
unsigned int i;
VALUE flag_keyword_hash = 0;
VALUE splat_flagged_keyword_hash = 0;
VALUE converted_keyword_hash = 0;
VALUE rest_last = 0;
vm_check_canary(ec, orig_sp);
/*
* Extend SP for GC.
*
* [pushed values] [uninitialized values]
* <- ci->argc -->
* <- ISEQ_BODY(iseq)->param.size------------>
* ^ locals ^ sp
*
* =>
* [pushed values] [initialized values ]
* <- ci->argc -->
* <- ISEQ_BODY(iseq)->param.size------------>
* ^ locals ^ sp
*/
for (i=calling->argc; i<ISEQ_BODY(iseq)->param.size; i++) {
locals[i] = Qnil;
}
ec->cfp->sp = &locals[i];
/* setup args */
args = &args_body;
given_argc = args->argc = calling->argc;
args->argv = locals;
args->rest_dupped = ci_flag & VM_CALL_ARGS_SPLAT_MUT;
if (UNLIKELY(ISEQ_BODY(iseq)->param.flags.anon_rest)) {
if ((ci_flag & VM_CALL_ARGS_SPLAT) &&
given_argc == ISEQ_BODY(iseq)->param.lead_num + (kw_flag ? 2 : 1) &&
!ISEQ_BODY(iseq)->param.flags.has_opt &&
!ISEQ_BODY(iseq)->param.flags.has_post &&
!ISEQ_BODY(iseq)->param.flags.ruby2_keywords &&
(!kw_flag ||
!ISEQ_BODY(iseq)->param.flags.has_kw ||
!ISEQ_BODY(iseq)->param.flags.has_kwrest ||
!ISEQ_BODY(iseq)->param.flags.accepts_no_kwarg)) {
args->rest_dupped = true;
}
}
if (kw_flag & VM_CALL_KWARG) {
args->kw_arg = vm_ci_kwarg(ci);
if (ISEQ_BODY(iseq)->param.flags.has_kw) {
int kw_len = args->kw_arg->keyword_len;
/* copy kw_argv */
args->kw_argv = ALLOCA_N(VALUE, kw_len);
args->argc -= kw_len;
given_argc -= kw_len;
MEMCPY(args->kw_argv, locals + args->argc, VALUE, kw_len);
}
else {
args->kw_argv = NULL;
given_argc = args_kw_argv_to_hash(args);
kw_flag |= VM_CALL_KW_SPLAT | VM_CALL_KW_SPLAT_MUT;
}
}
else {
args->kw_arg = NULL;
args->kw_argv = NULL;
}
if ((ci_flag & VM_CALL_ARGS_SPLAT) && (ci_flag & VM_CALL_KW_SPLAT)) {
// f(*a, **kw)
args->rest_index = 0;
keyword_hash = locals[--args->argc];
args->rest = locals[--args->argc];
if (ignore_keyword_hash_p(keyword_hash, iseq, &kw_flag, &converted_keyword_hash)) {
keyword_hash = Qnil;
}
else if (UNLIKELY(ISEQ_BODY(iseq)->param.flags.ruby2_keywords)) {
converted_keyword_hash = check_kwrestarg(converted_keyword_hash, &kw_flag);
flag_keyword_hash = converted_keyword_hash;
arg_rest_dup(args);
rb_ary_push(args->rest, converted_keyword_hash);
keyword_hash = Qnil;
}
else if (!ISEQ_BODY(iseq)->param.flags.has_kwrest && !ISEQ_BODY(iseq)->param.flags.has_kw) {
converted_keyword_hash = check_kwrestarg(converted_keyword_hash, &kw_flag);
if (ISEQ_BODY(iseq)->param.flags.has_rest) {
arg_rest_dup(args);
rb_ary_push(args->rest, converted_keyword_hash);
keyword_hash = Qnil;
}
else {
// Avoid duping rest when not necessary
// Copy rest elements and converted keyword hash directly to VM stack
const VALUE *argv = RARRAY_CONST_PTR(args->rest);
int j, i=args->argc, rest_len = RARRAY_LENINT(args->rest);
if (rest_len) {
CHECK_VM_STACK_OVERFLOW(ec->cfp, rest_len+1);
given_argc += rest_len;
args->argc += rest_len;
for (j=0; rest_len > 0; rest_len--, i++, j++) {
locals[i] = argv[j];
}
}
locals[i] = converted_keyword_hash;
given_argc--;
args->argc++;
args->rest = Qfalse;
ci_flag &= ~(VM_CALL_ARGS_SPLAT|VM_CALL_KW_SPLAT);
keyword_hash = Qnil;
goto arg_splat_and_kw_splat_flattened;
}
}
else {
keyword_hash = converted_keyword_hash;
}
int len = RARRAY_LENINT(args->rest);
given_argc += len - 2;
}
else if (ci_flag & VM_CALL_ARGS_SPLAT) {
// f(*a)
args->rest_index = 0;
args->rest = locals[--args->argc];
int len = RARRAY_LENINT(args->rest);
given_argc += len - 1;
if (!kw_flag && len > 0) {
rest_last = RARRAY_AREF(args->rest, len - 1);
if (RB_TYPE_P(rest_last, T_HASH) && FL_TEST_RAW(rest_last, RHASH_PASS_AS_KEYWORDS)) {
// def f(**kw); a = [..., kw]; g(*a)
splat_flagged_keyword_hash = rest_last;
if (!(RHASH_EMPTY_P(rest_last) || ISEQ_BODY(iseq)->param.flags.has_kw) || (ISEQ_BODY(iseq)->param.flags.has_kwrest)) {
rest_last = rb_hash_dup(rest_last);
}
kw_flag |= VM_CALL_KW_SPLAT | VM_CALL_KW_SPLAT_MUT;
// Unset rest_dupped set by anon_rest as we may need to modify splat in this case
args->rest_dupped = false;
if (ignore_keyword_hash_p(rest_last, iseq, &kw_flag, &converted_keyword_hash)) {
if (ISEQ_BODY(iseq)->param.flags.has_rest) {
// Only duplicate/modify splat array if it will be used
arg_rest_dup(args);
rb_ary_pop(args->rest);
}
else if (arg_setup_type == arg_setup_block && !ISEQ_BODY(iseq)->param.flags.has_kwrest) {
// Avoid hash allocation for empty hashes
// Copy rest elements except empty keyword hash directly to VM stack
flatten_rest_args(ec, args, locals, &ci_flag);
keyword_hash = Qnil;
kw_flag = 0;
}
given_argc--;
}
else if (!ISEQ_BODY(iseq)->param.flags.has_rest) {
// Avoid duping rest when not necessary
// Copy rest elements and converted keyword hash directly to VM stack
flatten_rest_args(ec, args, locals, &ci_flag);
if (ISEQ_BODY(iseq)->param.flags.has_kw || ISEQ_BODY(iseq)->param.flags.has_kwrest) {
given_argc--;
keyword_hash = converted_keyword_hash;
}
else {
locals[args->argc] = converted_keyword_hash;
args->argc += 1;
keyword_hash = Qnil;
kw_flag = 0;
}
}
else {
if (rest_last != converted_keyword_hash) {
rest_last = converted_keyword_hash;
arg_rest_dup(args);
RARRAY_ASET(args->rest, len - 1, rest_last);
}
if (ISEQ_BODY(iseq)->param.flags.ruby2_keywords && rest_last) {
flag_keyword_hash = rest_last;
}
else if (ISEQ_BODY(iseq)->param.flags.has_kw || ISEQ_BODY(iseq)->param.flags.has_kwrest) {
arg_rest_dup(args);
rb_ary_pop(args->rest);
given_argc--;
keyword_hash = rest_last;
}
}
}
}
}
else {
args->rest = Qfalse;
if (args->argc > 0 && (kw_flag & VM_CALL_KW_SPLAT)) {
// f(**kw)
VALUE last_arg = args->argv[args->argc-1];
if (ignore_keyword_hash_p(last_arg, iseq, &kw_flag, &converted_keyword_hash)) {
args->argc--;
given_argc--;
}
else {
if (!(kw_flag & VM_CALL_KW_SPLAT_MUT) && !ISEQ_BODY(iseq)->param.flags.has_kw) {
converted_keyword_hash = rb_hash_dup(converted_keyword_hash);
kw_flag |= VM_CALL_KW_SPLAT_MUT;
}
if (last_arg != converted_keyword_hash) {
last_arg = converted_keyword_hash;
args->argv[args->argc-1] = last_arg;
}
if (ISEQ_BODY(iseq)->param.flags.ruby2_keywords) {
flag_keyword_hash = last_arg;
}
else if (ISEQ_BODY(iseq)->param.flags.has_kw || ISEQ_BODY(iseq)->param.flags.has_kwrest) {
args->argc--;
given_argc--;
keyword_hash = last_arg;
}
}
}
}
if (flag_keyword_hash) {
FL_SET_RAW(flag_keyword_hash, RHASH_PASS_AS_KEYWORDS);
}
arg_splat_and_kw_splat_flattened:
if (kw_flag && ISEQ_BODY(iseq)->param.flags.accepts_no_kwarg) {
rb_raise(rb_eArgError, "no keywords accepted");
}
switch (arg_setup_type) {
case arg_setup_method:
break; /* do nothing special */
case arg_setup_block:
if (given_argc == 1 &&
allow_autosplat &&
!splat_flagged_keyword_hash &&
(min_argc > 0 || ISEQ_BODY(iseq)->param.opt_num > 1) &&
!ISEQ_BODY(iseq)->param.flags.ambiguous_param0 &&
!((ISEQ_BODY(iseq)->param.flags.has_kw ||
ISEQ_BODY(iseq)->param.flags.has_kwrest)
&& max_argc == 1) &&
args_check_block_arg0(args)) {
given_argc = RARRAY_LENINT(args->rest);
}
break;
}
/* argc check */
if (given_argc < min_argc) {
if (arg_setup_type == arg_setup_block) {
CHECK_VM_STACK_OVERFLOW(ec->cfp, min_argc);
given_argc = min_argc;
args_extend(args, min_argc);
}
else {
argument_arity_error(ec, iseq, given_argc, min_argc, max_argc);
}
}
if (given_argc > max_argc && max_argc != UNLIMITED_ARGUMENTS) {
if (arg_setup_type == arg_setup_block) {
/* truncate */
args_reduce(args, given_argc - max_argc);
given_argc = max_argc;
}
else {
argument_arity_error(ec, iseq, given_argc, min_argc, max_argc);
}
}
if (ISEQ_BODY(iseq)->param.flags.has_lead) {
args_setup_lead_parameters(args, ISEQ_BODY(iseq)->param.lead_num, locals + 0);
}
if (ISEQ_BODY(iseq)->param.flags.has_rest || ISEQ_BODY(iseq)->param.flags.has_post){
args_copy(args);
}
if (ISEQ_BODY(iseq)->param.flags.has_post) {
args_setup_post_parameters(args, ISEQ_BODY(iseq)->param.post_num, locals + ISEQ_BODY(iseq)->param.post_start);
}
if (ISEQ_BODY(iseq)->param.flags.has_opt) {
int opt = args_setup_opt_parameters(args, ISEQ_BODY(iseq)->param.opt_num, locals + ISEQ_BODY(iseq)->param.lead_num);
opt_pc = (int)ISEQ_BODY(iseq)->param.opt_table[opt];
}
if (ISEQ_BODY(iseq)->param.flags.has_rest) {
if (UNLIKELY(ISEQ_BODY(iseq)->param.flags.anon_rest && args->argc == 0 && !args->rest && !ISEQ_BODY(iseq)->param.flags.has_post)) {
*(locals + ISEQ_BODY(iseq)->param.rest_start) = args->rest = rb_cArray_empty_frozen;
args->rest_index = 0;
}
else {
args_setup_rest_parameter(args, locals + ISEQ_BODY(iseq)->param.rest_start);
VALUE ary = *(locals + ISEQ_BODY(iseq)->param.rest_start);
VALUE index = RARRAY_LEN(ary) - 1;
if (splat_flagged_keyword_hash &&
!ISEQ_BODY(iseq)->param.flags.ruby2_keywords &&
!ISEQ_BODY(iseq)->param.flags.has_kw &&
!ISEQ_BODY(iseq)->param.flags.has_kwrest &&
RARRAY_AREF(ary, index) == splat_flagged_keyword_hash) {
((struct RHash *)rest_last)->basic.flags &= ~RHASH_PASS_AS_KEYWORDS;
RARRAY_ASET(ary, index, rest_last);
}
}
}
if (ISEQ_BODY(iseq)->param.flags.has_kw) {
VALUE * const klocals = locals + ISEQ_BODY(iseq)->param.keyword->bits_start - ISEQ_BODY(iseq)->param.keyword->num;
if (args->kw_argv != NULL) {
const struct rb_callinfo_kwarg *kw_arg = args->kw_arg;
args_setup_kw_parameters(ec, iseq, args->kw_argv, kw_arg->keyword_len, kw_arg->keywords, klocals);
}
else if (!NIL_P(keyword_hash)) {
bool remove_hash_value = false;
if (ISEQ_BODY(iseq)->param.flags.has_kwrest) {
keyword_hash = check_kwrestarg(keyword_hash, &kw_flag);
remove_hash_value = true;
}
args_setup_kw_parameters_from_kwsplat(ec, iseq, keyword_hash, klocals, remove_hash_value);
}
else {
#if VM_CHECK_MODE > 0
if (args_argc(args) != 0) {
VM_ASSERT(ci_flag & VM_CALL_ARGS_SPLAT);
VM_ASSERT(!(ci_flag & (VM_CALL_KWARG | VM_CALL_KW_SPLAT | VM_CALL_KW_SPLAT_MUT)));
VM_ASSERT(!kw_flag);
VM_ASSERT(!ISEQ_BODY(iseq)->param.flags.has_rest);
VM_ASSERT(RARRAY_LENINT(args->rest) > 0);
VM_ASSERT(RB_TYPE_P(rest_last, T_HASH));
VM_ASSERT(FL_TEST_RAW(rest_last, RHASH_PASS_AS_KEYWORDS));
VM_ASSERT(args_argc(args) == 1);
}
#endif
args_setup_kw_parameters(ec, iseq, NULL, 0, NULL, klocals);
}
}
else if (ISEQ_BODY(iseq)->param.flags.has_kwrest) {
args_setup_kw_rest_parameter(keyword_hash, locals + ISEQ_BODY(iseq)->param.keyword->rest_start,
kw_flag, ISEQ_BODY(iseq)->param.flags.anon_kwrest);
}
else if (!NIL_P(keyword_hash) && RHASH_SIZE(keyword_hash) > 0 && arg_setup_type == arg_setup_method) {
argument_kw_error(ec, iseq, "unknown", rb_hash_keys(keyword_hash));
}
if (ISEQ_BODY(iseq)->param.flags.has_block) {
if (ISEQ_BODY(iseq)->local_iseq == iseq) {
/* Do nothing */
}
else {
args_setup_block_parameter(ec, calling, locals + ISEQ_BODY(iseq)->param.block_start);
}
}
#if 0
{
int i;
for (i=0; i<ISEQ_BODY(iseq)->param.size; i++) {
ruby_debug_printf("local[%d] = %p\n", i, (void *)locals[i]);
}
}
#endif
ec->cfp->sp = orig_sp;
return opt_pc;
}
static void
raise_argument_error(rb_execution_context_t *ec, const rb_iseq_t *iseq, const VALUE exc)
{
VALUE at;
if (iseq) {
vm_push_frame(ec, iseq, VM_FRAME_MAGIC_DUMMY | VM_ENV_FLAG_LOCAL, Qnil /* self */,
VM_BLOCK_HANDLER_NONE /* specval*/, Qfalse /* me or cref */,
ISEQ_BODY(iseq)->iseq_encoded,
ec->cfp->sp, 0, 0 /* stack_max */);
at = rb_ec_backtrace_object(ec);
rb_backtrace_use_iseq_first_lineno_for_last_location(at);
rb_vm_pop_frame(ec);
}
else {
at = rb_ec_backtrace_object(ec);
}
rb_ivar_set(exc, idBt_locations, at);
rb_exc_set_backtrace(exc, at);
rb_exc_raise(exc);
}
static void